A posting for Dark Souls 2 on the PC has appeared on Amazon, seemingly leaking the release date.
What’s important to keep in mind here is that there has been no official confirmation from Bandai Namco, so it’s entirely possible that the date shown (which you can see in the image below is just a placeholder.
Amazon US is currently listing the release date as May 31, which would make sense given that it is releasing on all other platforms on March 11 this year. However, the fact that Amazon has the download size listed at 3KB, kinda makes me think that the information shown is inaccurate. But it’s possible that that is just a placeholder until Bandai Namco release the PC requirements.